Toyota corolla verso blowing white and blue smoke

Many thanks for your reply The car drives absolutely fine no lumpyness or nothing and seems to only happen when. The car is hot and no smoke on start up which is normally indicates head gasket which you on start up also check water and oil on dayley basis and not losing water or see any oil in water ? I did get told it's more then likely to be diesel particular filter coming to its end off life?. And also these cars have a fifth injector on the exhaust which pumps fuels into the exhaust to clean the dpf which if not working properly could cause the whitey blue smoke out the exhaust? Any idea on this information?